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object Test {
trait Seq[+t] {
type MyType[+t] <: Seq[t]
def f: MyType[t]
}
// illegal abstract type member refinement: changes the arity of MyType
// the error is pretty strange, since the compiler forms the illegal type xs.MyType[a] anyway
def span[a, s <: Seq[a] { type MyType/*look ma, no type parameters!*/ <: s } ](xs: s): s
= xs f
// ^
// found : xs.MyType[a]
// required: s
}
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